The ore deposits of Utah . B. SMITHSONITE PSEUDOMORPIIS AFTER CALCITE, FROM THE SEVENTH LEVEL OF THE HORN SILVER MINE. Natural C. COVELLITE REPLACING ZINC SULPHIDE. Zinc sulphide in the center surrounded by zones of covellite containing considerable uureplaced zinc sulphide, from the Horn Silver mine. Collected by D. P. Rolling. U. S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 111 PLATE XXIV Ck. i: ^^.^M .^ h KHft ^iMil *^?ia!^^.*!^*^ . • -^ M dft 1 1 * i 4 t^ .. ? Mm t w\ i 7.* fc •>.«*fiS 1 ?*?.;;. 1

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou